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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad204efccf7410867f4da47a45a7738372614bbd0caf4d94e39ab75117a77de' 
  AND token = '4LkyD//r4c6W2kw5XAUAKKoXoFF1JI1t0XCVkK7eweA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}